"We will be eager to hear his thoughts on state sovereignty and independence once he has broken free from his dependence on Russian energy, as U.S. President Donald Trump and European partners insisted multiple times," Foreign Minister Andrii Sybiha said.
Best option (for both Ukraine and the EU, perhaps even Hungary) would be to suspend Hungary from the EU and Schengen for 3 years.
They can be brought back even before the 3 year period if they show a desire to do so.